when I saw someone responded to this, I figured it would be you @lukestokes, even before I looked at the username. That's the whole reason there is a need to sign up through facebook or redditt (I believe that is still true). Steemit is looking for unique individual users who will engage and use the system, not total number of accounts.
I guess people could keep making email accounts and facebook accounts and sign up for the steem power and only vote on one users post and eventually power down and transfer to one account, but most trying to game the system are looking for a quick buck and not willing to get their money over years.
I know how to game systems pretty well. It's just how my mind works. It's gotten me in some trouble, but I can now use it to point out bugs or exploits to help a community instead of just myself.
Thanks @bendjmiller222. Even then though, 3 Steem Power isn't going to impact much of anything. That's the whole point of this design. It's those who are VESTed which get to influence the network. Having 100 accounts at 3 Steem each is still only 300 Steem Power. Not exactly a whale and certainly not an influential vote, even if combined. The white paper gets into this stuff in detail, but I guess many haven't read it or thought it through.
Regarding defences against this kind of gaming, such as with bots, for example, well, first of all, flagging works effectively to push them off the page with subzero reputations, but I think that some kind of minor PoW that cannot be accelerated would limit user post rates, same as what HashCash (the precursor to bitcoin, in fact) and Bitmessage do, precisely to rate-limit spamming. Bitcoin uses it to rate-limit new coin issuance. It works as an inflation controller, but as Steem proves, you can direct inflation to useful purposes. Dash also demonstrates this principle as well, by redirecting it to fund development and platform marketing. Steem doesn't need this because the users themselves are the biggest marketers, and right now, playtesters, and maybe eventually the idea of this being a governance system to regulate developers may become integrated too.